Basecamp 4.6.2

I would like to get a safe version of 4.6.2 for my Windows based computer. I would like to be able to use Google Earth. I have found a site but when I tried to install the software I got an error message "MIS Install error" and the install quits. I also tried another site with the same result. Is there a site I can go to? 

I am having trouble loading a route on my Zumo after the last update.